jdk-7-for-compilation requirement is obsolete

@@ -6,7 +6,7 @@ ScalaInterpreterPane is a Swing component for editing code in the Scala programm

## requirements

ScalaInterpreterPane currently compiles against Scala 2.11, 2.10 and is build with sbt 0.13. To compile, sbt must run on a Java 1.7 system, because there is a source incompatibility with generified Swing classes in Java 1.7 versus 1.6. The result runs on Java 1.6 systems nevertheless.

ScalaInterpreterPane currently compiles against Scala 2.11, 2.10 and is build with sbt 0.13.